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AUSTRALIA lock James Horwill is in doubt for Saturday night's Tri-Nations rugby clash against South Africa after copping a heavy knock to his sternum at training in Perth.
Horwill was forced to sit out the latter half of the session conducted in driving rain and will be assessed by team doctors.
Fellow second-rower Dan Vickerman, who was sidelined for Australia's Test wins over Ireland and France after undergoing ankle surgery following the Super 14 season, is also in some doubt after failing to complete the session.
Vickerman made a successful return to club rugby over the weekend and trained on Monday but sat out the last part of the session.
The 29-year-old iced his right ankle for 20 minutes and was limping noticeably afterwards.
But in better news, inside centre Berrick Barnes, who injured his shoulder against France, got through the physical session unscathed.
"It's good. I got through that contact session fine and as you saw it was pretty physical," Barnes said.
"I'll be having plenty more (hits) come Saturday night so we know what to expect."